MAX2235
Info: : PRODUCTION
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MAX2235

+3.6V, 1W Autoramping Power Amplifier for 900MHz Applications

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $2.97
Features
  • 800MHz to 1000MHz Operation
  • High Output Power at 836MHz
    • +32.5dBm at +5.0V
    • +30dBm at +3.6V
    • +29dBm at +3.0V
    • +28dBm at +2.7V
  • +2.7V to +5.5V Single-Supply Operation
  • Automatic Power-Up/Power-Down Ramp
  • Direct On/Off Keying (OOK) without Intersymbol Interference or VCO Pulling
  • 37dB Power-Control Range
  • 47% Efficiency
  • < 1µA Supply Current in Shutdown Mode
  • Small 20-Pin TSSOP Package with Heat Slug
Additional Details
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The MAX2235 low-voltage, silicon RF power amplifier (PA) is designed for use in the 900MHz frequency band. It operates directly from a single +2.7V to +5.5V supply, making it suitable for use with 3-cell NiCd or 1-cell Li-Ion batteries. The device delivers +30dBm (1W) typical output power from a +3.6V supply or +28dBm from a +2.7V supply.

The MAX2235's gain is adjustable over a 37dB range. A power-control pin controls gain and bias to maintain optimum efficiency, even at lower output power levels, thus extending the operating life of the battery. At +30dBm output power, efficiency is typically 47%. An additional power-saving feature is a shutdown mode that typically reduces supply current below 1µA.

A key feature of this PA is its autoramping capability. During turn-on and turn-off periods, the RF envelope is controlled to approximate a raised cosine on the rising and falling edge, thereby minimizing transient noise and spectral splatter. The ramp time is set by selecting the value of an external capacitor.

The MAX2235 is intended for use in constant envelope applications such as AMPS, two-way paging, or FSK-based communications in the 900MHz ISM band. The device is available in a thermally enhanced 20-pin TSSOP package with a heat slug.

Applications

  • 900MHz ISM-Band Applications
  • Analog Cellular Phones
  • Microcellular GSM (Power Class 5)
  • Two-Way Paging
  • Wireless Data Networks
Part Models 2
1ku List Price Starting From $2.97

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX2235EUP+
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MAX2235EUP+T
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX2235EVKIT

MAX2235 Evaluation Kit

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MAX2235EVKIT

MAX2235 Evaluation Kit

MAX2235 Evaluation Kit

Features and Benefits

  • Easy Evaluation of MAX2235
  • +2.7V to +5.5V Single-Supply Operation
  • RF Input and Output Matched for Operation from 824MHz to 849MHz
  • All Critical Peripheral Components Included

Product Detail

The MAX2235 evaluation kit (EV kit) simplifies evaluation of the MAX2235 power amplifier (PA). It enables testing of the device's RF performance and requires no additional support circuitry. The EV kit's signal inputs and outputs use SMA connectors to facilitate the connection of RF test equipment.

The MAX2235 EV kit is assembled with a MAX2235 and incorporates input and output matching components optimized for the 824MHz to 849MHz RF frequency band. All matching components may be changed to work at RF frequencies from 800MHz to 1000MHz.

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